Lock for screw fastening members



March 7, 1933. I B; E WINKLER 1,900,146

LOCK FOR SCREW FASTENING MEMBERS Filed June 25, 1931 J4 a f IN VEN TOR.

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. f? f e 92 y Patented 7, 1 933 BRUNO WINKLEB, OF DETROIT, MICHIGAN Locx ron scimw risrnnme'xmnas Application filed June 25.

The object of my invention is to provide means whereby nuts, bolts, cap-screws, or similar fastening members adapted for operation by means of a wrench or other tool may be protected against unauthorized removal, the said invention being particularly adapted for use in securing wheels upon the axles or wheel-carriers of automobiles and other vehicles.

,A further object of my invention is to provide a device for the purpose above stated which is simple in construction and economical to manufacture.

With these objects in view the'invention 5 consists in the improved construction, ar-

rangement, and combination of parts which will be hereinafter fully described, reference being had to the accompanying drawing which illustrates a preferred embodiment thereof, in which drawing- Figure 1 illustrates the. application of my said invention to an automobile wheel of ordinary construction.

Figure 2 shows a transverse section of a special nut employed in connection therewith.

Figure 3 is anend elevation of the same.

Figure 4 is aperspective view of the sleeve used for covering the facets of the nut and preventing the application of a wrench to the same.

Figure 5 is a side elevation of a lock for securing the said sleeve inposition upon the nut.

Figure 6 is an end view of the same. Figure 7 is a longitudinal section showing the complete assembly, and

Figure 8 is an end view of the same. Like characters designate corresponding parts throughout the several views.

a is a hexagonal nut havingthe usual facets a1, adapted-to be engaged by a wrench, and the internally threaded portion (12 adapted to be screwed upon a bolt. 6 is a frusto-com ical or conoidal surface which fits within an 5 opening of corresponding shape in the wheel, as well known in the art. The nut, as shown, extends outwards beyond the threaded portion and is provided with the internal bore a3 of suitable diameter to receive the barrel of a tumbler lock f, and intermediate'of the 1081-. Serial in. 546,781.

nular groove 0 of lar er iameter than the said bore. In diametrically opposed relation and co-extensive with the bore a3 are the slots d, shown more clearly in Figures 2 and 3. A

e is a sleeve havin a bore e1 adapted to fit over the corners of t e nut and to rotate freely thereupon, the said sleeve being also robore a3 and the threaded ortion is the anvided with the short enlarged bore or re ate 62. a j is the lock having the usual cylindrical 7 barrel 9 and provided with tumblers h which outer circumference ofthe barrel and are so proportioned as .tobe slidable longitudinally within the slots d in the nut and to be rotatable within the annular groove 0 in the same, as will be hereinafter explained.

' The operation of my device will be now explained with particular reference to theassembly shown in Figure 7. y The nut being screwed in place by the application of a wrench in the ordinary manner, the sleeve 6 is laced in position over the same. The lock f, aving the key inserted and the tumblers h consequently withdrawn within thebarrel g, is laced within the nut, the ends f2 of the I extend beyond the surface of the barrel when 10 f1 the ends f2 of which project beyond the mem r 1 passing throu h the slots d into the ann ar groove 0 and t e flange i entering the rebate 62 of the sleeve e. The key then being rotated through degrees and withdrawn, the tumblers h are urged outwards by their spring or springs and brought into engagement with one of the slots d, thereby preventing further rotation of the barrel. By this movement, the tumblers being located at right angles to the member fl, as will be seen by reference to Figure 6, the lock is held securely in place since the ends f2 of the said member have meantime moved'around within the annular groove 'c-- 'until they are no longer coincident with' the slots d, and l wfithdrawal of the lock is consequently impossible until the key is re-inseroed and the operations reversed. Access of dirt or dust to the interior of the lock is prevented by the cover 3' pivoted at jl and secured in the closed position by friction or other means.

It will be observed from the foregoing that I have provided a locking means which is exceedingly simple in construction and economical to manufacture, and while- I have herein described a preferred embodiment of mi invention as applied to an automobile w eel, it will be readily understood by those skilled in the art that the same may be modified in various ways to meet any particular or peculiar requirement and may be adapted for uses other than that above referred to without departin from the spirit of my invention. lit wil be also understood that while the lock as herein described has a single set of tumblers at right angles to the transverse member f1 I do not confine myself to this particular construction, but may use any iisulgl commercial form of cylindrical barrel 0c Havin thus described'my said invention, what c aim as new and desire to secure by Letters Patent of the United States is:

In a device of the character described,

the combination, with a fixed member having screw threads, and a removable member provided with co-acting screw threads and with external tool-enga 'n means, of a sleeve having smooth, un ro en internal and external cylindrical surfaces and rotatable and. reciprocable upon said removable member and adapted to enclose the said tool-engaging means, a recess within said-removable memher having an internal annular groove and a slot communicating therewith from the outside, a barrel fitting within said recess having a projection adapted to pass through said slot and to engage said annular groove, key operated retractable tumbler means upon said barrel non-coincident with said projection for engagin said slot and preventing rotation of said arrel to remove the same,

and a flange on said barrel for retaining the said sleeve in place lon 'tudinally.

In testimony whereo 1i afix my signature.

BRUNO ERNEST NKLER.

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